Room temperature two-dimensional antiferromagnetic Weyl semimetal CrO with giant spin-splitting and spin-momentum locked transport

TL;DR

This paper predicts a 2D antiferromagnetic Weyl semimetal CrO with giant spin-splitting, spin-momentum locking, and tunable electronic states under strain, opening new possibilities for 2D antiferromagnetic spintronics.

Contribution

It introduces a novel 2D antiferromagnetic Weyl semimetal CrO with unique spintronic properties and demonstrates how strain can manipulate its electronic states.

Findings

CrO has large spin-split band structure with Weyl points at the Fermi level.

Strain can tune the Weyl points, enabling four distinct spintronic states.

CrO exhibits high Néel temperature and spin-momentum locked transport.

Abstract

Giant spin-splitting was recently predicted in collinear antiferromagnetic materials with a specific class of magnetic space group. In this work, we have predicted a two-dimensional (2D) antiferromagnetic Weyl semimetal (WS), CrO with large spin-split band structure, spin-momentum locked transport properties and high N\'eel temperature. It has two pairs of spin-polarized Weyl points at the Fermi level. By manipulating the position of the Weyl points with strain, four different antiferromagnetic spintronic states can be achieved: WSs with two spin-polarized transport channels (STCs), WSs with single STC, semiconductors with two STCs, and semiconductors with single STC. Based on these properties, a new avenue in spintronics with 2D collinear antiferromagnets is proposed.